MACROINVERTEBRATES AS BIOLOGICAL INDICATORS OF WATER QUALITY IN RIVERS OBA AND OSUN, SOUTH WEST, NIGERIA
Macroinvertebrates and water quality of rivers Oba and Osun in Iwo, south west, Nigeria was investigated. Two sampling stations were identified at each of the two rivers. Sampling was from February, 2018 to June, 2018. Biotic indices were used for the assessment of the water bodies, this include Hilsenhoff Family Biotic Index (FBI), Biodiversity indices and Sorensen Quotient (SQ). A total of 24 taxa (Family level) in 3 phyla inhabited the two rivers. The phyla are Arthropods, Molluscs and Annelids. Station 1 had the largest number (23) of taxa while the least (14) was in Station 4. The highest taxa diversity occurred at station 3, while the least was at Station 4. Based on the outcome of FBI analysis, there was very little variation in the water quality at River Oba, but marked variation was recorded in River Osun. SQ revealed that paired stations 2 and 4 were the most similar stations while stations 2 and 4 were the most dissimilar paired stations. In conclusion, Station 3 was substantially polluted while station 4 may have some organic pollutant but can be rated as good.
Adu Babasola (Primary Presenter/Author), The Federal University of Technology, Akure, Nigeria , firstname.lastname@example.org;